Hi @goldensrbest If the file recommended doesn't get rid of your calluses, the acids won't help. I have used them. The acids are for superficial dead skin, not thick calluses.
Honestly, the best remedy for calluses is to change your shoes. I don't know where your calluses are, so it's hard to suggest what change is needed, but calluses are caused by friction which probably means the shoes are not giving you a good fit. I stop using shoes that give me calluses and throw them out. Moleskin on the shoe might help, but it depends on where the calluses are and what the shoes are made of. If the shoes are not genuine leather, the moleskin is unlikely to help because other materials have no give. My guess is the shoes are too tight/small, or just don't fit your foot correctly. Some shoes dig in in certain places.
I find files work best for calluses, but I have used a callus shaver tool with sharp replaceable blades on occasion. See below. Please if you use, be careful. Many podiatrists don't recommend them, so I am not going to either, I am just sharing that I use them on certain calluses, depending on where they are and whether I think I can reduce the callus without breaking skin.

Most often, I will use the file previously recommended, or an electric callus remover. This one works for me

It's from Amazon, there are many similar ones, I think qvc used to sell one and maybe it still does. I use something like this for smaller areas or to smooth edges:

QVC offers one similar to the bottom one for about $65, but I usually pay less than $10 for this at the drugstore/Walgreens - where ever you can find a manicure section. It uses a battery.
These electric tools are intended for use in very short periods of time, which is why a regular battery is fine.
Need to be very careful not to overfile, not to break the skin or cause pain.
I then smooth the shaved callus area with a thick cardboard file as previously recommended. The skin will remain darkened where the callus was/remains. I won't risk breaking the skin to remove the dark skin. The skin will lighten with time, but mine never go away completely. Scar products have not lightened mine. I just live with my toes as they are.
If anything hurts or bleeds, I have gone too far and stop immediately and treat the broken skin.
Follow with a rinse or wash, and then Alpha cream works for me.
And stay away from the shoes that cause the callus.